1. Adding and Subtracting
Integers

2. When adding integers, remember the following pneumonic devices:
U S B
L A S S dd
ign
ame
ubtract
ike signs
nlike signs
igger number

3. Adding Like Terms (LASS)
-6 + (-8) Like signs, so simply Add
= 14, and then keep the same sign -
Adding Unlike Terms (USB)
6 + (-8) Unlike signs, so Subtract 8
- 6 2
= 2 -
Then keep the sign of the Bigger number

4. Let’s Practice Click on the correct answer.=
a. 2
b. -2
c. 8
d. -8

5. Sorry! Try again

6. You’ve done it! Let’s ride right on to the next one.

7. (-3)
a. 1
b. -1
c. 7
d. -7

8. Sorry, Dude—Maybe you need new glasses!
Try Again

9. HI—YA! Way to Go!
On to the next one!

10. (-3) =
a. 5
b. -5
c. 11
d. -11

11. Aw! Come on! Don’t look so sad! You can try again!

12. You’ve unlocked the right door! Now on to subtracting integers

13. COPY, CHANGE, CHANGE Subtracting Integers
When you subtract integers, it’s easy to remember the following:
COPY, CHANGE, CHANGE

14. COPY, CHANGE, CHANGE 4 – 9 4 + (-9) - = 5 Copy the first number
Change the minus sign to addition
Change the second number to
its opposite (sign) 4 +
(-9) -
= 5
Now you are adding unlike signs (USB), so subtract And Keep the sign of the bigger number

15. More Practice
4. 2 – 10 =
a. 8
b. -8
c. 12
d. -12

16. Let’s not run out of steam here! You can give it another shot!

17. You’re blasting off!
Way to go!!
Blast your way to the
next one!

18.
a. 10
b. -10
c. 20
d. -20

19. It looks like you’ve
got more work to do!
Sorry, try again!

20. Way to Go!!
You’re #1
Now on to #6

21. – (-4)
a. 6
b. -6
c. 14
d. -14

22. OOPS! An empty locker!
Try again!

23. You’ve fought long and hard, but you WON the battle!!
Click here to set it up for the next person